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單項(xiàng)選擇題

Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）

A.excessive speed
B.improper warm-up
C.extreme misalignment
D.inadequate lubrication

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單項(xiàng)選擇題

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）

A.Sludge
B.Gasoline
C.Fuel oil
D.Lube oil

單項(xiàng)選擇題

The amount of fuel delivered by a unit injector is controlled by the （）

A.camshaft
B.main spring
C.rack position
D.nozzle orifice size